如何从我的选择器中获取价值? Xamarin形式 [英] How to get the value from my picker? Xamarin forms

问题描述

我很难从选择器中找出所选的string. 这是我的代码:

I have trouble to get out the selected string from my picker. This is my code:

XAML:

<Picker x:Name="thePicker" >
    <Picker.Items>
        <x:String>info1</x:String>
        <x:String>info2 </x:String>
    </Picker.Items>
</Picker>

代码:

thePicker.SelectedIndex = 1; //here is the problem i suppose, any idea what i should type?
var ourPickedItem = thePicker.Items[thePicker.SelectedIndex];

现在，即使我选择数字2，我也只获得值"info1".它与SelectedIndex有关，因此它只选择"1"，但是我不确定如何编写代码它适用于所选项目.

Now I only get the value "info1" even if i select number 2. It has something to do with the SelectedIndex so it only picks the "1", but I am not sure how to write the code to make it work for the selected item.

推荐答案

您应该查看此:

picker.SelectedIndexChanged += (sender, args) =>
{
    if (picker.SelectedIndex == -1)
    {
        boxView.Color = Color.Default;
    }
    else
    {
        string colorName = picker.Items[picker.SelectedIndex];
        boxView.Color = nameToColor[colorName];
    }
};

否则，在新的Xamarin Forms版本2.3.4中存在

Otherwise in new Xamarin Forms Release 2.3.4 exists the

可绑定的选择器

您可以设置一个ItemSource

you can set an ItemSource

<Picker ItemsSource="{Binding Countries}" />

并绑定SelectedIndex属性

and Bind the SelectedIndex property

SelectedIndex="{Binding CountriesSelectedIndex}"

这篇关于如何从我的选择器中获取价值? Xamarin形式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！